SLING-3093 : editing of values in the 'Connection' section of a (wst) server was clumsy due to curser-reset on each typed character. Fixed.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1525811 13f79535-47bb-0310-9956-ffa450edef68